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Immunity characteristics — Limits and methods of measurement

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1. Digital POTS ISDN POTS ISDN Digital port port Exercising p Telephone Exercising equipment ISDN NT equipment IEC 2022 10 Figure H 1 DSL access system configuration For passband systems such as ADSL and VDSL the EUT typically comprises a DSL modem and splitter filter via which the POTS ISDN port is presented The modem and splitter may be separate units or combined into one unit For baseband systems such as HDSL and SHDSL or passband systems where the DSL modem does not include the splitter then the equipment under test as shown in Figure H 1 will not include the parts denoted with a dotted line and hence measurements at the POTS ISDN port do not apply Immunity testing shall be performed with the digital transmission system trained up and operating at its nominal transmission rate such that the full freguency spectrum used by the system is utilised If the system can be operated in asymmetric and symmetric modes then the BS EN 55024 2010 CISPR 24 IEC 2010 41 testing shall be carried out for each of these modes of operation For ADSL and VDSL applications ports shall be configured in rate adaptive mode For HDSL the data rate shall be set at 1 Mb s For SHDSL the data rate shall be set at 2 Mb s Further details can be found in the following documents see Table H 1 below Table H 1 ITU T recommendations for xDSL systems ITU T Recommend
2. E 1 Particular test conditions No standard image is required but the use of a pattern consisting of a grid of lines and a scale of grey tones is recommended Testing shall be performed in the stand by mode and the copying mode E 2 Particular performance criteria Performance criterion A The EUT shall operate without degradation of performance or loss of function during and after the application of the disturbance For example there shall be no unintended start of operation change of the program or of the program setting for example e single or double sided e number of copies e sorting and or stapling e contrast e copy size reduction or enlargement e loss of stored or transmitted data interruption of copying sequence for example paper feed failure false indications for example paper feed failure low toner low paper control indicators fall back to stand by mode from copying mode unintended operation of safety interlocks degradation of copied images beyond manufacturer s specification errors in billing devices Performance criterion B As for performance criterion A with the following exception False indications of for example paper feed failure low toner low paper control indicators are permissible during the test A paper feed failure is allowed only if after removal of the feeding error sheets the job is automatically recovered and no damage occurs to the original do
3. Limits and methods of measurement 3 Terms and definitions For the purposes of this document the terms and definitions given in IEC 60050 161 and the following apply 3 1 degradation unwanted change in operational performance of an EUT due to electromagnetic disturbances This does not necessarily mean malfunction or catastrophic failure 3 2 equipment under test EUT representative device or functionally interactive group of devices that is a system which includes one or more host units that is subjected to test procedures specified in this publication 3 3 information technology equipment ITE any equipment a which has a primary function of either or a combination of entry storage display retrieval transmission processing switching or control of data and of telecommunication messages and which may be equipped with one or more terminal ports typically operated for information transfer b with a rated supply voltage not exceeding 600 V It includes for example data processing equipment office machines electronic business equipment and telecommunication equipment Any equipment or part of the ITE equipment which has a primary function of radio trans mission and or reception according to the ITU Radio Regulations are excluded from the scope of this publication BS EN 55024 2010 CISPR 24 IEC 2010 9 NOTE Any equipment which has a function of radio transmission and or reception according to t
4. Table H 2 Example cable attenuation Technology Cable attenuation HDSL 35 dB SHDSL 30 dB ADSL 45 dB VDSL 10 dB Where cable is used during the test the cable type used should match the cable type used to provide service within the access network Shielded Twisted Pair STP cables should only be used during the test when STP cables exist within the access network If many cable types Unshielded Twisted Pair UTP and STP are to be used to provide service within the access network testing should be performed with each cable type The cable type s used during test should be recorded in the test report Other ports should be either terminated in their nominal impedance or connected to associated equipment that simulates the functional termination of the port BS EN 55024 2010 42 CISPR 24 O IEC 2010 H 3 Particular test requirements for electrical fast transient tests For application of this test to the xDSL telecommunication port a repetition rate of 100 kHz burst length 0 75 ms shall be used H 4 Particular performance criteria The performance of the EUT shall be verified by e measuring the additional errors induced due to the application of any electromagnetic phenomena e testing the functionality of the system at the cessation of test e ensuring that any software or stored data corruption has not occurred e measuring the audio signal break through demodulated 1 kHz at any POTS port whilst continuous i
5. for example NT or simulator connected to the EUT shall not have any influence on the result of the testing In cases where a manufacturers specification requires external protection devices or measures which are clearly specified in the user s manual then the test reguirements of this standard shall be applied with the external protection devices or measures in place During testing the environmental conditions and supply voltages shall remain within the operating ranges specified for the product unless otherwise indicated in the basic standard If an earth connection independent of the power supply cable is provided this earth connection shall be installed according to the specifications of the manufacturer for the tests given in Tables 1 to 4 BS EN 55024 2010 CISPR 24 IEC 2010 15 6 2 Particular conditions EUT operational modes etc The particular conditions specified in the annexes take precedence over the corresponding parts of the general conditions Where particular conditions for specific functions are not given in this standard then the general conditions shall apply 7 Performance criteria 7 1 General performance criteria The manufacturer has the obligation to express the performance criteria in terms which relate to the performance of his specific product when used as intended The following performance criteria are applicable and shall only be evaluated when the functions referred to are implemented
6. accordance with its functional specifications e g for the maximum length of cable connected to it is not considered to be a telecommunications network port under this definition 3 17 analogue interface an interface that transmits and receives signals whose characteristic quantities follow continuously the variations of another physical quantity representing information BS EN 55024 2010 CISPR 24 IEC 2010 11 3 18 acoustic interface port at which audio signals emanate and or originate 3 19 associated eguipment AE eguipment needed to exercise and or monitor the operation of the EUT in a representative way 4 Immunity test requirements 4 1 General The immunity test requirements for equipment are given on a port by port basis Tests shall be conducted in a well defined and reproducible manner The tests shall be carried out as single tests in sequence The sequence of testing is optional The description of the test the test generator the test methods and the test set up are given in IEC basic EMC standards which are referred to in the following tables The contents of these IEC basic EMC standards are not repeated here however modifications or additional information needed for the practical application of the tests are given in this publication 4 2 Particular requirements 4 2 1 Electrostatic discharges ESD The test procedure shall be in accordance with IEC 61000 4 2 with the following modifications and clar
7. considerations some tests are specified in defined frequency bands or at selected frequencies Equipment which fulfils the requirements at these frequencies is deemed to fulfil the requirements in the entire frequency range from 0 Hz to 400 GHz for electromagnetic phenomena The test requirements are specified for each port considered NOTE 1 Safety considerations are not covered in this publication NOTE 2 In special cases situations will arise where the level of disturbance may exceed the levels specified in this publication for example where a hand held transmitter is used in proximity to equipment In these instances special mitigation measures may have to be employed 2 Normative references The following referenced documents are indispensable for the application of this document For dated references only the edition cited applies For undated references the latest edition of the referenced document including any amendments applies IEC 60050 161 1990 International Electrotechnical Vocabulary IEV Chapter 167 Electromagnetic compatibility IEC 60318 1 2009 Electroacoustics Simulators of human head and ear Part 1 Ear simulator for the measurement of supra aural and circumaural earphones IEC 61000 4 2 2008 Electromagnetic compatibility EMC Part 4 2 Testing and measurement techniques Electrostatic discharge immunity test IEC 61000 4 3 2006 Electromagnetic compatibility EMC Part 4 3 Testing and
8. line to line kV peak 2 line to earth kV peak or ground 4 5 Electrical fast transients 1 kV peak IEC 61000 4 4 Tr Th ns Repetition o frequency kHz a The frequency range is scanned as specified However when specified in Annex A an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted test are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 Changes to occur at 0 degree crossover point of the voltage waveform When the manufacturer specifies protection measures and it is impractical to simulate these measures during the tests then the applied test levels shall be reduced to 0 5 kV line to line and 1 kV line to earth ground BS EN 55024 2010 CISPR 24 IEC 2010 19 Annex A normative Telephony terminal equipment A 1 General This annex covers the requirements for the testing of telephony terminal equipment which may provide audio or voice functionality over PSTN ISDN LAN or any other type of telecommunication network Examples of telephony terminal equipment include POTS Plain Old Telephone Sets conference telephones small key telephone systems video conference systems facsimile machines The requirements of other applicable annexes also apply During testing the EUT shall be configured for connection to a telecommunication line at its nominal impedance Associated equipment may be used to simulate the telecom
9. m to 3 0 m 4 2 3 Continuous radio freguency disturbances 4 2 3 1 General The freguency range for the radiated field test is 80 MHz to 1 000 MHz The freguency range for the continuous conducted test is 0 15 MHz to 80 MHz The freguency ranges are scanned as specified however at a limited number of selected frequencies a more comprehensive functional test may be required The requirement to undertake this additional selected frequency test is not universally applicable to all products but only to products which have this requirement specified in Annex A under particular product specific requirements The selected frequencies are given in Tables 1 to 4 The dwell time at each frequency shall not be less than the time necessary for the EUT to be exercised and to be able to respond However the dwell time shall not exceed 5 seconds at each of the frequencies during the scan The time to exercise the EUT shall not be interpreted as a total time of a programme or a cycle but related to the reaction time in case of failure of the EUT Unless required by an annex of this document clock and other sensitive frequencies do not need to be assessed separately 4 2 3 2 Continuous radiated disturbances The test procedure shall be in accordance with IEC 61000 4 3 The EUT shall be positioned so that the four sides of the EUT shall be exposed to the electromagnetic field in sequence In each position the performance of the EUT will be investigat
10. shall be operated in the condition that was found to produce the highest overall emissions or if this is not Known the default settings upon start up The POST shall be evaluated in all modes unless the most susceptible mode is already Known from preliminary testing or previous experience in which case the most susceptible mode shall be used G 2 Particular performance criteria Performance criterion A The EUT shall operate without degradation of performance or loss of function during and after the application of the disturbance For example there shall be no system response time beyond the figure defined by the manufacturer memory errors data corruption repeated self recoverable errors beyond a number specified by the manufacturer loss of stored data keyboard lock up system reset or shut down system change state network connections dropping BS EN 55024 2010 CISPR 24 IEC 2010 39 money or receipts inappropriately dispensed I O errors I O state change Performance criterion B As for performance criterion A with the following exception Keyboard lock up or corruption of information of a single item within a transaction is permitted during the application of the disturbance provided that the event is recorded and the user alerted After the disturbance is removed normal operation of the EUT shall be recoverable to the condition immediately before the ap
11. 000 4 5 See 4 e and 9 10 700 Tr Th us 4 kV peak 10 700 Tr Th us e e Electrical fast 0 5 kV peak IEC 61000 4 4 See ef transients 5 50 Tr Th ns 5 Repetition frequency kHz The frequency range is scanned as specified However when specified in Annex A an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted tests are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 Applicable only to ports which according to the manufacturer s specification may connect directly to outdoor cables Applicable only to cables which according to the manufacturer s specification supports communication on cable lengths greater than 3 m For ports where primary protection is intended surges are applied at voltages up to 4 kV with the primary protectors fitted Otherwise the 1 kV test level is applied without primary protection in place Test applied to all lines simultaneously to earth ground For xDSL equipment the repetition frequency for EFT testing shall be 100 kHz See Annex H Where the coupling network for the 10 700 us waveform affects the functioning of high speed data ports the test shall be carried out using a 1 2 50 8 20 us waveform and appropriate coupling network Table 3 Immunity input d c power port excluding equipment marketed with a a c d c power converter Environmental Test Basic Performance phenomenon specification standa
12. 2 Internal EUT S2 to EUT S3 External telecommunication nework ETN for example battery feed and telephone terminal Extension cables internal telecommunications network External network port IEC 2021 10 Figure A 5 Example of typical small key telephone system or PABX Ideally the main unit EUT M and the terminals EUT Sx should be tested as separate EUTs with the other part acting as the AE The EUT shall be arranged in accordance with the requirements of the basic standards In tests where continuous RF disturbances are applied to any port of the main unit an attached terminal should be used for monitoring any 1 kHz signal demodulated by the main unit in accordance with Table A 7 using the methods given in A 2 2 or A 2 3 The attached terminal will ensure any demodulated signal sent to the internal network port is measured at the same time However it will still be necessary to measure the level of demodulated signal sent out via any external network ports in accordance with Table A 7 using the methods given in A 2 4 For continuous radiated disturbance tests applied to the main unit only it is recommended that the terminal used for monitoring any demodulated 1 kHz signal is placed outside of the test environment When the test phenomenon is applied to an external network port it is important to ensure that a call path is established from the monitoring terminal via the main unit to the extern
13. BS EN 55024 2010 i i Fai Mb Fa O 1 iN i pi Fi h y r F iS r i A i F dL 1 Gi i j A i F TA j 4 ike Soe WILD i c BSI n dg 7 UG 7 il iy a v bh i e Us Yg T il sE Te b in y Bs am a oe B a i f Me w ho NW sa TE a a he a 7 1 7 i bw Ta E 4 A U r gt ie i F i 1 i BSI Standards Publication Q Ce am wa 2 o NA LO o ep T Information technology equipment Immunity characteristics Limits and methods of measurement NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide BS EN 55024 2010 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 55024 2010 It is identical to CISPR 24 2010 It supersedes BS EN 55024 1998 A2 2003 which will be withdrawn on 1 December 2013 The UK participation in its preparation was entrusted to Technical Committee GEL 210 11 EMC product standards A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application BSI 2011 ISBN 978 0 580 61236 7 ICS 33 100 20 35 020 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published und
14. Belgium Bulgaria Croatia Cyprus the Czech Republic Denmark Estonia Finland France Germany Greece Hungary Iceland Ireland Italy Latvia Lithuania Luxembourg Malta the Netherlands Norway Poland Portugal Romania Slovakia Slovenia Spain Sweden Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comite Europ en de Normalisation Electrotechnique Europaisches Komitee fur Elektrotechnische Normung Management Centre Avenue Marnix 17 B 1000 Brussels 2010 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 55024 2010 E BS EN 55024 2010 EN 55024 2010 2 Foreword The text of document CIS I 331 FDIS future edition 2 of CISPR 24 prepared by CISPR SCI Electromagnetic compatibility of information technology equipment multimedia equipment and receivers was submitted to the IEC CENELEC parallel vote and was approved by CENELEC as EN 55024 on 2010 11 16 This European Standard supersedes EN 55024 1998 EN 55024 1998 IS1 2007 A1 2001 A2 2003 This EN 55024 2010 includes the following significant technical changes with respect to the previous edition dated references updated option of using a 4 step size for continuous conducted immunity test deleted revision of Annex A for telephony equipment including methodology for measuring the demodulation from a speaker hands free devi
15. EC 2010 31 B 4 Data input B 4 1 Particular test conditions Data shall be acquired with input devices such as keyboard mouse magnetic card reader optical character reader image scanner input pen or miscellaneous sensors Though continuous input is preferable testing in the stand by condition is permitted for EUT which requires operator s attendance for operation When the EUT is a mass data input device such as a character reader or scanner then the central processing unit shall run a program which reads an appropriate test chart continuously for the duration of the test Read data inputs are displayed printed directly or stored for later evaluation B 4 2 Particular performance criteria Performance criterion A During testing unintended input from an input device is not allowed During testing input devices shall maintain the specified quality image data Performance criterion B During testing Keyboard mouse lock up is not allowed For EUT with manually inputted data that can be confirmed by reading the display errors are permissible during testing if they can be recognised by the operator and easily corrected Performance criterion C Failures during test that result in a delay in processing or a system abort which after testing can be recovered to normal operation by reset or reboot are permissible B 5 Data printing B 5 1 Particular test conditions Data shall be printed by printers or plotters For EUT
16. Examples of functions defined by the manufacturer to be evaluated during testing include but are not limited to the following essential operational modes and states tests of all peripheral access hard disks floppy disks printers keyboard mouse etc quality of software execution quality of data display and transmission quality of speech transmission 7 2 Performance criterion A During and after the test the EUT shall continue to operate as intended without operator intervention No degradation of performance or loss of function is allowed below a minimum performance level specified by the manufacturer when the EUT is used as intended The performance level may be replaced by a permissible loss of performance If the minimum performance level or the permissible performance loss is not specified by the manufacturer then either of these may be derived from the product description and documentation and by what the user may reasonably expect from the EUT if used as intended 7 3 Performance criterion B After the test the EUT shall continue to operate as intended without operator intervention No degradation of performance or loss of function is allowed after the application of the phenomena below a performance level specified by the manufacturer when the EUT is used as intended The performance level may be replaced by a permissible loss of performance During the test degradation of performance is allowed
17. However no change of operating state or stored data is allowed to persist after the test If the minimum performance level or the permissible performance loss is not specified by the manufacturer then either of these may be derived from the product description and documentation and by what the user may reasonably expect from the EUT if used as intended 7 4 Performance criterion C During and after testing a temporary loss of function is allowed provided the function is self recoverable or can be restored by the operation of the controls or cycling of the power to the EUT by the user in accordance with the manufacturer s instructions BS EN 55024 2010 16 CISPR 24 O IEC 2010 Functions and or information stored in non volatile memory or protected by a battery backup shall not be lost 7 5 Particular performance criteria The particular performance criteria which are specified in the normative annexes take precedence over the corresponding parts of the general performance criteria Where particular performance criteria for specific functions are not given then the general performance criteria shall apply Product documentation The specification used by the manufacturer to define the performance criteria for the testing reguired by this standard shall be made available to the user upon reguest 9 Measurement uncertainty When applying the test levels given in Tables 1 to 4 the requirements shall not be changed ba
18. L2 ITU T Recommendation G 992 5 Asymmetrical digital subscriber line DSL transceivers Extended bandwidth ADSL2 ADSL2plus ITU T Recommendation G 993 1 Very high speed digital subscriber line transceivers VDSL ITU T Recommendation G 993 2 Very high speed digital subscriber line transceivers 2 VDSL2 ITU T Recommendation G 996 1 Test procedures for digital subscriber line DSL transceivers ITU T Recommendation l 241 1 Teleservices supported by an ISDN Telephony This page deliberately left blank v m af Ke o y r A To D British Standards Institution BSI BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible the identity of which can be found on the inside front cover Tel 44 0 20 8996 9000 Fax 44 0 20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically r
19. NOTE Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard BS EN 55024 2010 CISPR 24 IEC 2010 CONTENTS FORE TORF D G GOETRE E E DEU EWCH OCD En deena econeuanaeenemonedeunwenddavausceseusvedessese 4 INTRODUCCION orr ad a DS Od ee DOS O EU ae eee ee Co AFU LU Ga GU E E 6 1 So lae HN _ _ EEEE AEE ee ACYN NR NS IF ND T 2 Normative references ccccccccece ccc ec LL LL eee RR LL ens e nese RR eeaeeseaeeaeeaeeseaseaseaeaseaseaeageages 7 3 Terms and CS NMOS RE T 8 4 Immunity test requirements cccc ccc cc ccc LL LL GL GLY LG RL LL RR LL LE LL LLA YL RR Y Yw nuu 11 Al a Me FA AN PEN YC NN AFR RY RF FY RY EE RF PY NT EFFRO 11 4 2 Particular redgulreneillS eu De RG GG RG UR CW SY ORG Y CD O Ui A 11 4 2 1 Electrostatic discharges ES Lu LG de WC ag DUW Bd O a 11 4 2 2 Electrical fast transients EFT sssencccndnocncudsadecesametemudiedscnuenls etaetsavceiedeows 12 4 2 3 Continuous radio frequency disturbances ccc cee YY LY eee Y Y Y Y eaeeeeaes 12 4 2 4 Power freguency magnetic fieldS cccccccccceceececeeceeeeaeeeesseaeaseseseaseaes 13 7s OPA MU O O O E E G 13 4 2 6 Voltage dips and interruptions ccccccce ec ece LL LG RY LLY RY Y
20. O for digital systems is impressed on the telecommunication line signal level without the radio frequency field The resulting acoustic sound level is measured using a microphone The measured level shall be used and recorded as the reference level The signal used to establish the reference level is switched off during the actual test The 3 dB bandwidth of the measurement equipment shall be 100 Hz 20Hz The background noise shall be at least 15 dB below the reference level The demodulated acoustic noise measured in the same set up used for recording the reference level shall not be greater than the values given in Table A 3 For measuring the level of demodulated signal present at a speaker hands free phone the method shown in Figure A 3 shall be used BS EN 55024 2010 CISPR 24 IEC 2010 23 Table A 3 Maximum acoustic demodulated levels relative to reference level Freguency band Type of Maximum demodulated level continuous RF b MHz immunity test dB see except 26 95 to 27 29 Reference level 10 dB see and 80 to 1 000 except at 900 Radiated Reference level 10 dB 900 see Radiated Reference level 10 dB The 900 MHz test is at a single spot frequency accuracy 1 MHz This requirement is not applicable for countries where no digital mobile services operate at this freguency The 3dB bandwidth of the measurement equipment shall be 100 Hz 20Hz Levels change linearly with the logarithm
21. REF OE 35 Annex F normative Automatic teller machines ATM ccccceceeeeeeeeeeeeeeeeeeaeeeeeeeeeeaeaeaees 36 Annex G normative Point of sale terminals POST eI Y LL YL LG GLYW Y Y LLW Yan 38 Annex H normative xDSL Terminal eguipment e iY YL Y Y Y Y YA LLA YRR FRY LY Y Y Y Y Ynud 40 ENO GU AO FF RE NT RIF HRN FN RFC SEA CYRFF FF FREE EE EU NF DEN AE FF YF YNN DR AA Figure 1 Description of ports au Go sen di Y O Cy o YN yd CY Yd Ci OO 9 Figure A 1 Example sound coupling set up between the acoustic output device of a telephone handset and an artificial ear for detecting demodulated sound pressure level 21 Figure A 2 Example test set up for measuring the sound pressure level from the acoustic output device of a telephone handsS6et 9 99YYY cece cee LL LL GL LL LG GL seateatentententeeaeeas 23 Figure A 3 Test setup for measuring the reference sound pressure level from a speaker hands free phone nennannnasunnesrnnsrrnnrrrnrrnnrrrnerrrnsrirerrrnsrrnarrrnerrrnrrrnerrrnrrrnnrrnerrrnerennn 24 Figure A 4 Demodulation on analogue lines Set UP cece cee LL LL LL eee ea eee eaeeeeaeeaeeneaey 25 BS EN 55024 2010 CISPR 24 IEC 2010 Figure A 5 Example of typical small Key telephone system or PABX cccceeeeseeeeeeeeees 2 Figure H 1 DSL access system configuration 0 ccc cece I cece GL GL LL estes eae eatee eae eatea
22. RY Y Y wadd 13 PADDING AOU NEFNYDD SN EE FR RFC RIN NY 13 1o i ei ull SC Lu fat PR ER YP HF AH EF NN R gt RH FR EF 14 01 General conditons FF _ e AF UNEAN NANENANE AE OAE a 14 6 2 Particular conditions EUT operational modes etc 9 I Y cece LL YL Y uii 15 ORM OTRE E _ Y e ux_ NR HY NT EEO auction TC CAF AR CR RF 15 7 1 General performance criteria uu ue iu Gu Su DU RT Un SM FF SF A GO RR 15 T2 Pernormance CHOOSE UC OO FN 15 ro eii aei criterion Y a a A RR NF 15 tA Pernormance criterion a CU esteem GU TU CE GU DOD 15 1 5 Particular performance criteria xs au de aain dnd I YSU dn Un dd o GN Ui UA dd DF 16 SB Prod ct documentalioi ud aa CD GA acted A DA FO UAD ees 16 9 Measurement uncertainty eie id Duw NO OR Guy CG WR FA EOG LLEF O LO SEO Cw Eu 16 VO Immunity requirements ene nU NOG g dwyni GYG ddn gi GYS Hn gd GWYN oy yw Dn Y wn 16 Annex A normative Telephony terminal eguipment I YL Y LL LG GL LG LL GY GL Y WY Lduud 19 Annex B normative Data processing edguipment l i LY Y LL LG GL LL Y LL LL Y Y GL FFY Y Ynaud 29 Annex C normative Local area networks LAN LY Y I LL LL Y esse ease eeeeeeeeeeaeaeeeeeeneatanes 33 Annex D normative Printers and plotters aviisisvssivevertwdecedusueasoivindecstulnesewusaonsedubieacriasieawteabea 34 Annex E mon uc Copying am CHLO Ei ded Tn ODd EN Sio GN AEF G
23. a Where the EUT configuration is a call to an external network connection ETN then the measurement of the demodulated noise sent into this external line shall be carried out in accordance with A 2 4 of this table Where it is chosen to use an internal call path to another terminal EUT S2 as the configuration a measurement shall be made at the EUT S2 using methods given in A 2 2 or A 2 3 of this table EUT S2 is just an example it may be replaced with another terminal such as EUT S1 or EUT S3 In this case the monitoring port shall be changed accordingly Conducted common mode disturbance injected on to external network port towards the EUT M direction may be demodulated into differential mode signal within the external network circuit and may be sent not only to EUT S1 but also AE via 2 W 4 W circuits within the EUT M It is therefore necessary to measure and check the acoustic sound pressure level of the EUT S1 and AE Conducted common mode disturbance injected into an internal network port towards the EUT M direction may be demodulated into a differential mode signal within the internal network circuits and may be sent not only to AE but also EUT S1 S2 via 2 W 4 W circuits within the EUT M It is therefore necessary to measure and check the sound pressure level of EUT S1 EUT S2 and AE BS EN 55024 2010 CISPR 24 IEC 2010 29 Annex B normative Data processing eguipment B 1 General The test shall be carried out usi
24. acoustic measuring interface shall attempt to scatter the incident audio wave and hence reduce the likelihood of a pressure build up at the entry of the tube Where necessary in order to reduce reverberation at 1 kHz consider applying acoustic absorption material in the room The centre of the speaker is the X on the diagram The devices used to measure the audio levels shall be designed to minimize the impact on the applied field Figure A 3 Test setup for measuring the reference sound pressure level from a speaker hands free phone A 2 4 Measurement method demodulation along analogue lines This test measures the amount of 1 KHz narrowband signal that is demodulated by the EUT and injected differentially into the telecommunication network for an analogue line During testing the levels may be measured using the following process 1 Set up the EUT and AE in accordance with Figure A 4 This arrangement provides the ability to measure the demodulated 1 kHz present on the telephone line The filter shown in Figure A 1 is a band pass filter centred at 1 kHz with a 3 dB bandwidth of 100 Hz 20 Hz BS EN 55024 2010 CISPR 24 IEC 2010 25 O Feeding i Euege see EUT a purpose of the EUT Balun a e see Filter 1 KHz band pass Measurement amplifier IEC 2020 10 The feeding bridge curre
25. al network port to which the test phenomenon is being applied The following table defines the test configurations and performance assessment methods to be used for continuous conducted and radiated disturbance tests Other reguirements are also given in A 2 1 BS EN 55024 2010 28 CISPR 24 O IEC 2010 Table A 7 Test configurations and performance assessment methods applicable to a PABX and associated terminals for continuous RF disturbance tests EM Phenomenon EUT port EM phenomenon applied to A 2 2 or A 2 3 Conducted RF ETN of EUT M EUT S1to AE At EUT S1 AE to EUT S1 EUT S2 and EUT S2 to and AE EUT S3 See Conducted RF ITN 1 of EUT M EUT S1 to AE At EUT S1 AE to EUT S1 EUT S2 and and EUT S2 to AE EUT S3 See Conducted RF AC power of EUT S1 to AE At EUT S1 EUT M EUT S1 to EUT S2 EUT S2 and AE to EUT S1 Conducted RF ITN of EUT S1 EUT S1 to AE At EUT S1 EUT S1 to and EUT S2 EUT S2 and AE to EUT S1 Radiated RF Enclosure of EUT S1 to AE At EUT S1 EUT M AE to EUT S1 EUT S2 and EUT S2 and AE EUT configuration Performance assessment methods Call path to EUT S3 Radiated RF Enclosure of EUT S1 to AE At EUT S1 and See Yes EUT S1 and AE to EUT S1 AE NOTE 1 The contact area on the handset is based on Clause 8 of CISPR 16 1 2 NOTE 2 For an example sound coupling set up refer to Figure A 1 NOTE 3 For example the reference sound pressure level measurement refer to Figures A 2 and A 3
26. as CRT monitors if they are the only sensitive parts In this case and if the CRT monitor is integral with the ITE then the CRT monitor or sensitive device may be removed for testing 4 2 5 Surges The test procedure shall be in accordance with IEC 61000 4 5 4 2 6 Voltage dips and interruptions The test procedure shall be in accordance with IEC 61000 4 11 5 Applicability Tests shall be applied to the relevant ports of the EUT according to Tables 1 to 4 It may be determined from consideration of the electrical characteristics and usage of particular EUT that some of the tests are inappropriate and therefore unnecessary In such a case it is required that both the decision and the justification not to apply any particular test to any particular port be recorded in the test report Multifunction equipment which is subjected simultaneously to different clauses of this standard and or other standards shall be tested with each function operated in isolation if this can be achieved without physically modifying the equipment internally The equipment thus tested shall be deemed to have complied with the requirements of all clauses standards when each function has satisfied the requirements of the relevant clause standard For example a personal computer with a broadcast reception function shall be tested with the broadcast reception function disabled according to this standard and then tested with only the broadcast reception function activat
27. ate change BS EN 55024 2010 CISPR 24 IEC 2010 37 Performance criterion B There shall be no loss of stored data during the application of the disturbance A transaction may be aborted provided that this is correctly reported There shall be no incorrect dispensing of money or printed receipts Degradation of the performance as described in criterion A is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test In these cases operator response is permitted to re initiate an operation Performance criterion C There shall be no loss of function following the restoration of the system by the operator Loss or corruption of the contents of Random Access Memory RAM and information stored on permanent storage media such as hard drive optical or floppy disk is not permitted Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable or can be restored after the test by the operator BS EN 55024 2010 38 CISPR 24 O IEC 2010 Annex G normative Point of sale terminals POST G 1 Particular test conditions The Point of Sale Terminal POST shall be connected to each of its peripheral devices such as scales scanner and card reader and one of each type of communication line shall be connected to the correct terminating equipment or a representative l
28. ation G 996 1 Test procedures for digital subscriber line DSL transceivers ITU T Recommendation G 992 1 Asymmetrical digital subscriber line ADSL transceivers ITU T Recommendation G 992 3 Asymmetrical digital subscriber line ADSL transceivers 2 ADSL2 ITU T Recommendation G 992 5 Asymmetrical digital subscriber line DSL transceivers more tones ADSL2plus ITU T Recommendation G 991 1 High bit rate Digital Subscriber Line HDSL transceivers ITU T Recommendation G 991 2 Single pair high speed digital subscriber line SHDSL transceivers ITU T Recommendation G 993 1 Very high speed digital subscriber line transceivers VDSL ITU T Recommendation G 993 2 Very high speed digital subscriber line transceivers 2 VDSL2 Testing shall be made with a value of the line attenuation such that the system will be operating in representative conditions of use The test set up may be configured using a Line Simulator or real cable lengths representative of actual use and installation Cable lengths vary between operators networks because of for instance installation practices geographic location In absence of further guidance from network operators the cable lengths that result in the attenuation values given in Table H 2 or cable simulators that provide an equivalent line attenuation value measured at 300 kHz shall be used during testing Other cables lengths used shall be documented in the test report
29. ce inclusion of new annex related to DSL equipment Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights The following dates were fixed latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement dop 2011 09 01 latest date by which the national standards conflicting with the EN have to be withdrawn dow 2013 12 01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EU Directives 1999 5 EC and 2004 108 EC See Annex ZZ Annexes ZA and ZZ have been added by CENELEC Endorsement notice The text of the International Standard CISPR 24 2010 was approved by CENELEC as a European Standard without any modification BS EN 55024 2010 3 EN 55024 2010 Annex ZA normative Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document For dated references only the edition cited applies For undated references the latest edition of the referenced document including any amendments applies NOTE When an international publication has been mo
30. cuments All false indications must be removed when the copier is reset to the stand by mode after the completion of the test Performance criterion C Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test or can be restored after the test by the operator An exception to this is that no unintended start of copying from stand by mode is allowed BS EN 55024 2010 36 CISPR 24 O IEC 2010 Annex F normative Automatic teller machines ATM F 1 Particular test conditions The ATM shall be connected to each of its peripheral devices and one of each type of communication line shall be connected driven into the correct terminating eguipment or a representative load Interconnecting cables shall be of a type and length specified in the individual equipment requirements One subassembly of each type of ITE necessary for the basic operation shall be included in the ATM to be evaluated For a system one of each type of ITE that can be included in the possible system configuration shall be included with the ATM In the case of ATMs which functionally interact with other ITE including any ITE that is dependent on the ATM for its power interface either the actual interfacing EUT or simulators may be used to provide representative operating conditions provided the effects of the simulator ca
31. dified by common modifications indicated by mod the relevant EN HD applies Publication Year Title EN HD Year IEC 60050 161 1990 International Electrotechnical Vocabulary IEV Chapter 161 Electromagnetic compatibility IEC 60318 1 2009 Electroacoustics Simulators of human head EN 60318 1 2009 and ear Part 1 Ear simulator for the measurement of supra aural and circumaural earphones IEC 61000 4 2 2008 Electromagnetic compatibility EMC EN 61000 4 2 2009 Part 4 2 Testing and measurement techniques Electrostatic discharge immunity test IEC 61000 4 3 2006 Electromagnetic compatibility EMC EN 61000 4 3 2006 A1 2007 Part 4 3 Testing and measurement A1 2008 A2 2010 techniques Radiated radio frequency A2 2010 electromagnetic field immunity test IEC 61000 4 4 2004 Electromagnetic compatibility EMC EN 61000 4 4 2004 Part 4 4 Testing and measurement techniques Electrical fast transient burst immunity test IEC 61000 4 5 2005 Electromagnetic compatibility EMC EN 61000 4 5 2006 Part 4 5 Testing and measurement techniques Surge immunity test IEC 61000 4 6 2008 Electromagnetic compatibility EMC EN 61000 4 6 2009 Part 4 6 Testing and measurement techniques Immunity to conducted disturbances induced by radio frequency fields IEC 61000 4 8 2009 Electromagnetic compatibility EMC EN 61000 4 8 2010 Part 4 8 Testing and measurement techniques Power frequency magnetic field immunity te
32. e if the AC mains power port is under test all the functions of the EUT shall be monitored using the appropriate method whilst the RF is injected into the AC mains power port BS EN 55024 2010 20 CISPR 24 O IEC 2010 With regard to this annex the term lossless means that no attenuation of the audio signal occurs at a junction interface or connection for example the amplitude of the audio signal is the same at both sides of a through connection in a screened room wall When applying this annex consideration needs to be given to various functions of the EUT which may have a direct impact on the test These may need to be considered separately as some functions may have a direct impact upon how the test is performed or how the EUT reacts Elements to be considered include e mute functions e echo cancelling capabilities e noise cancelling circuitry Where possible these functions shall be disabled The configuration of the EUT with respect to these functions shall be noted in the test report The volume control where it exists shall be set as close as possible to the position which gives the nominal value as stated by the manufacturer The actual volume level used for example 75 of full shall be noted in the test report For ISDN interfaces using basic access mode the telephony service to the EUT shall be in idle mode as defined for the applied digital to analogue conversion When applying continuous conduct
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34. ed BS EN 55024 2010 CISPR 24 IEC 2010 13 In the case where the most sensitive surface side of the EUT is known throughout the freguency range for example via preliminary tests testing may be restricted to that surface side only Where it is not possible to determine the most sensitive face with any certainty for example where different faces are sensitive at different freguencies all four faces shall be tested If the EUT is too large such that it cannot be fully illuminated by the radiating antenna or exceeds the size of the Uniform Field Area UFA then partial illumination shall be used The EUT can be repositioned so that the front surface remains within the UFA in order to illuminate those sections of the EUT that were previously outside the UFA 4 2 3 3 Continuous conducted disturbances There shall be no additional deviations from IEC 61000 4 6 other than those specified in 4 2 3 1 4 2 4 Power freguency magnetic fields The test procedure shall be in accordance with IEC 61000 4 8 The EUT shall be arranged and connected to satisfy its functional reguirements and shall be placed at the centre of the coil system immersion method The cables supplied by the EUT manufacturer shall be used or in their absence suitable alternative cables of the type appropriate to the signals involved shall be used Physically large products need not be completely submerged in the magnetic field only the sensitive devices such
35. ed according to CISPR 20 if it can operate each function in isolation under normal operation BS EN 55024 2010 14 CISPR 24 IEC 2010 For equipment which it is not practical to test with each function operated in isolation or where the isolation of a particular function would result in the equipment being unable to fulfil its primary function or where the simultaneous operation of several functions would result in saving measurement time the EUT shall be deemed to have complied if it meets the provisions of the relevant clause standard with the necessary functions operated For example if a personal computer with a broadcast reception function cannot operate the broadcast reception function in isolation from the computing function the personal computer may be tested with the computing function and broadcast reception function activated according to this standard and to CISPR 20 with respect to these requirements Where an allowance is made excluding specific ports or frequencies or functions in a standard because of different test specification and or test set up and or performance criterion the allowance may be made when relevant functions within multifunction equipment are tested against a different standard e g excluding of the application of Table 2 to an antenna port or excluding of the evaluation of the broadcast function during a measurement of equipment containing the broadcast reception function according to this standard De
36. ed disturbances to telephony terminals an artificial hand in accordance with Clause 8 of CISPR 16 1 2 shall be applied to the handset of the equipment A 2 2 Measurement method sound pressure level spl This method measures the actual 1 kHz signal that is demodulated by the EUT and appears as an audible tone at the ear piece of a headset or handset The sound pressure level spl of the 1 kHz signal shall be measured using a calibrated artificial ear as defined in IEC 60318 1 coupled without loss to the acoustic output device of the EUT see Figure A 1 If lossless coupling can not be achieved this method is inappropriate and the reference level method A 2 3 shall be used The background acoustic noise shall be less than 40 dB spl The audio channel shall be open and active BS EN 55024 2010 CISPR 24 IEC 2010 21 Sound insulation box see Handset Artificial ear IEC 60318 1 see a Microphone To audio measuring Ground plane 7777 equipment IEC 2017 10 When used during radiated immunity test the artificial ear requires shielding denoted with the dashed line This shielding shall be removed during conducted immunity test The construction of the box shall not impact the RF signals reaching the EUT for example constructed from wood or plastic containing acoustic absorbent material Figure A 1 Example sound coupling set up between the acoustic output device of a telephone handset and an artif
37. ee LL A YL LLWY YY Y HL nu 41 Table H 2 Example cable attenuation cccccccccc scene eee LL GG GL LG LL RR RL LL YNE CDL Y wnn 41 BS EN 55024 2010 6 CISPR 24 IEC 2010 INTRODUCTION This CISPR publication establishes uniform requirements for the electromagnetic immunity of information technology equipment The test methods are given in the referenced Basic EMC Immunity Standards This publication specifies applicable tests test levels product operating conditions and assessment criteria BS EN 55024 2010 CISPR 24 IEC 2010 INFORMATION TECHNOLOGY EQUIPMENT IMMUNITY CHARACTERISTICS LIMITS AND METHODS OF MEASUREMENT 1 Scope and object This CISPR publication applies to information technology equipment ITE as defined in CISPR 22 The object of this publication is to establish requirements that will provide an adequate level of intrinsic immunity so that the equipment will operate as intended in its environment The publication defines the immunity test requirements for equipment within its scope in relation to continuous and transient conducted and radiated disturbances including electrostatic discharges ESD Procedures are defined for the measurement of ITE and limits are specified which are developed for ITE within the frequency range from 0 Hz to 400 GHz For exceptional environmental conditions special mitigation measures may be required Owing to testing and performance assessment
38. eeneaes 40 Table 1 Immunity enclosure DOM Lu cu cnu NO NAY ea RR RI Ra ST We A OH GY RG dm FU CR O SA 16 Table 2 Immunity signal ports and telecommunication ports ccc ccc LY LL LL LL LLY Lund 17 Table 3 Immunity input d c power port excluding eguipment marketed with a a c d c power CODIO ao Ga Y ddid DO O O GU DD Uw UED Nod 17 Table 4 Immunity input a c power ports including equipment marketed with a separate a c d c power converter sud i eL UG O FD OI ne YR YCS nd YN Dd A 18 Table A 1 Criteria applied to TTE functions used during continuous disturbances TS a E ENTER AF CS RY FEE CR ER GRY NU EF NNI FN INF DAU FEN E UYS EA NN YNN 19 Table A 2 Maximum acoustic demodulated levels at an ear piece I FL LLY Y Liu 22 Table A 3 Maximum acoustic demodulated levels relative to reference level 23 Table A 4 Maximum demodulated differential mode signals at analogue DortsS 25 Table A 5 TTE performance criteria for spot frequency tests c ccc ccc cc ece eee LL Y eaeeeenes 26 Table A 6 TTE performance criteria for non continuous radio frequency disturbances 26 Table A 7 Test configurations and performance assessment methods applicable to a PABX and associated terminals for continuous RF disturbance tests ee iii i eeeeees 28 Table H 1 ITU T recommendations for xDSL SySteM cece cece e
39. er the authority of the Standards Policy and Strategy Committee on 31 January 2011 Amendments issued since publication Date Text affected EUROPEAN STANDARD EN 55024 NORME EUROPEENNE EUROPAISCHE NORM November 2010 ICS 33 100 20 Supersedes EN 55024 1998 EN 55024 1998 1S1 2007 A1 2001 A2 2003 English version Information technology equipment Immunity characteristics Limits and methods of measurement CISPR 24 2010 Appareils de traitement de l information Einrichtungen der Informationstechnik Caract ristiques d immunite Storfestigkeitseigenschaften Limites et methodes de mesure Grenzwerte und Prufverfahren CISPR 24 2010 CISPR 24 2010 This European Standard was approved by CENELEC on 2010 11 16 CENELEC members are bound to comply with the CEN CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up to date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member This European Standard exists in three official versions English French German A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria
40. f a character or test object If a device is used that determines movement along the horizontal and vertical axes only the extent of the jitter shall be defined as the square root of the sum of the squares of the maximum horizontal and vertical differences Observations shall extend for periods of at least 4 s Measuring devices that sample scans shall accumulate a number of scans equivalent to at least 4 s of continuous observation The maximum jitter permitted is given by pe C1 03 x2 5 aa where J is the jitter in mm C isthe character height in mm Alternatively a field of 50 A m may be applied and a transparent graduated mask used to assess the jitter In this case the jitter shall not exceed 50 times the value in the above formula NOTE This test level is used to simplify the measurement of jitter Lesser values of the test level may be used if non linearity is experienced due to for example saturation of screening material The EUT shall be tested in two positions both perpendicular to the magnetic field Performance criterion B Screen disturbances during the application of the test are permissible if they self recover after removal of the external disturbance Performance criterion C Failures during the test that cannot self recover after removal of the external disturbance but which can be recovered after the test to normal operation by reset or reboot are permissible BS EN 55024 2010 CISPR 24 I
41. he definitions of the ITU Radio Regulations should fulfil the national radio regulations whether or not this publication is also valid Equipment for which all disturbance requirements in the frequency range are explicitly formul ated in other IEC or CISPR publications are excluded from the scope of this publication 3 1 of CISPR 22 2008 3 4 jitter of a cathode ray tube CRT monitor peak to peak variation in the geometric location of picture elements on the viewing surface of the CRT monitor 3 5 port particular interface of the specified EUT with the external electromagnetic environment see Figure 1 Enclosure port DC power port Earth port Information technology AC power port equipment Signal port Telecommunication port IEC 2016 10 Figure 1 Description of ports 3 6 enclosure port physical boundary of the EUT through which electromagnetic fields may radiate or impinge For plug in units the physical boundary will be defined by the host unit 3 7 telephony call process exercised in the network and the telecommunication terminal equipment TTE to allow interchange of information speech video or data with another TTE through the network NOTE The call should be operated in the way specified by the manufacturer For circuit switched services the exchange of data should be considered to be possible when a 64 kbit s channel or equivalent is available for both parties For packet service the exchange
42. icial ear for detecting demodulated sound pressure level During testing it is important to ensure that the measurement microphone itself does not impact on the measurement for radiated testing a plastic tube may be used to remove the microphone from the test area In this case correction for the loss created by the plastic tube at 1 kHz shall be included During testing the EUT shall meet the performance requirements given in Table A 2 BS EN 55024 2010 22 CISPR 24 O IEC 2010 Table A 2 Maximum acoustic demodulated levels at an ear piece re band Type of continuous RF Acoustic sound pressure level immunity test dB spl see 2 10 to 30 Conducted 55 to 75 see e and except 26 95 to 27 29 80 to 1 000 Radiated 75 except at The 900 MHz test is at a single spot frequency accuracy 1 MHz This requirement is not applicable for countries where no digital mobile services operate at this frequency The 3dB bandwidth of the measurement equipment shall be 100 Hz 20Hz Levels change linearly with the logarithm of the frequency At the transition frequencies the lower acoustic sound pressure level applies A 2 3 Measurement method reference level The reference level method is where an initial 1 kHz tone generated by the EUT is recorded prior to the test The demodulated 1 kHz audio tone from the EUT is measured during the test and compared to this recorded reference A sinusoidal signal of 1kHz 40dBm _ dBm
43. ifications Electrostatic discharges shall be applied only to those points and surfaces of the EUT which are expected to be touched during usual operation including user access as specified in the user manual for example cleaning or adding consumables when the EUT is powered The number of test points is EUT dependent The requirements of 8 3 1 and A 5 of IEC 61000 4 2 shall be taken into consideration when selecting test points The application of discharges to the contacts of open connectors is not required Guidance on the selection of actual test points is given in A 5 of IEC 61000 4 2 When selecting test points particular attention shall be given to keyboards dialing pads power switches mice drive slots card slots around communication ports etc The discharges shall be applied in two ways a Contact discharges to the conductive surfaces and to coupling planes The EUT shall be exposed to at least 200 discharges 100 each at negative and positive polarity at a minimum of four test points For table top equipment one of the test points shall be the centre front edge of the horizontal coupling plane which shall be subjected to at least 90 indirect discharges 25 of each polarity All other test points shall each receive at least 50 direct contact discharges 25 of each polarity All areas normally touched by the user should be tested If no direct contact test points are available then at least 200 indirect discharges shall be a
44. measurement techniques Radiated radio frequency electromagnetic field immunity test Amendment 1 2007 Amendment 2 2010 IEC 61000 4 4 2004 Electromagnetic compatibility EMC Part 4 4 Testing and measurement techniques Electrical fast transient burst immunity test BS EN 55024 2010 8 CISPR 24 IEC 2010 IEC 61000 4 5 2005 Electromagnetic compatibility EMC Part 4 5 Testing and measurement techniques Surge immunity test IEC 61000 4 6 2008 Electromagnetic compatibility EMC Part 4 6 Testing and measurement techniques Immunity to conducted disturbances induced by radio frequency fields IEC 61000 4 8 2009 Electromagnetic compatibility EMC Part 4 8 Testing and measurement techniques Power frequency magnetic field immunity test IEC 61000 4 11 2004 Electromagnetic compatibility EMC Part 4 11 Testing and measurement techniques Voltage dips short interruptions and voltage variations immunity tests CISPR 16 1 2 2003 Specification for radio disturbance and immunity measuring apparatus and methods Part 1 2 Radio disturbance and immunity measuring apparatus Ancillary equipment Conducted disturbances Amendment 1 2004 Amendment 2 2006 CISPR 20 2006 Sound and television broadcast receivers and associated equipment Immunity characteristics Limits and methods of measurement CISPR 22 2008 Information technology equipment Radio disturbance characteristics
45. munications network A 2 Continuous radio frequency disturbances A 2 1 General This clause defines the performance requirements for the EUT to the continuous radio frequency disturbance tests of 4 2 3 and Tables 1 to 4 The performance criteria are based upon limiting the amount of 1 kHz tone from the test signal that is demodulated within the EUT This demodulation may appear as unwanted noise from the acoustic interface of the EUT as an unintended signal appearing on the telecommunications line or disruption of the digital bit stream During the continuous disturbance testing of each port in accordance with Tables 1 to 4 all functions of the EUT shall be monitored using the methods defined in Table A 1 Table A 1 Criteria applied to TTE functions used during continuous disturbances testing A1 1 Dial capability used to establish a telephony n a n a call A1 2 Audio receiving capability via an ear piece A2 2 or A 2 3 headset or handset etc A1 3 Audio transmission capability via a n a microphone headset or handset etc A1 4 Hands free operation A 2 3 using Figure A 3 A1 5 Analogue line connection n a 2 Only applicable to EUT that provides emergency service call capability gt A call shall be maintained for the duration of the test The methods defined in Table A 1 give the immunity criteria for specific functions of the EUT These criteria must be applied during all continuous disturbance testing For exampl
46. n be isolated or identified The ATM shall execute a program which shall exercise each function whose integrity is to be assessed during the test As a minimum the functions noted below shall be assessed Where more than one function is to be assessed the software shall be flexible enough to permit the test operator to select certain functions if so desired A parallel or serial execution of the test is permitted provided that the ATM can operate in that manner To facilitate the testing the software shall alert the operator when a failure has occurred The ATM shall be operated using the default settings upon start up The ATM shall be evaluated in all modes unless the most susceptible mode is already known from preliminary testing or previous experience in which case the most susceptible mode shall be used F 2 Particular performance criteria Performance criterion A The EUT shall operate without degradation of performance or loss of function during and after the application of the disturbance For example there shall be no system response time beyond the figure defined by the manufacturer memory errors data corruption repeated self recoverable errors beyond a number specified by the manufacturer loss of stored data keyboard lock up system reset or shut down system change state network connections dropping money or receipts inappropriately dispensed O errors I O st
47. ng an exercising program which can repeat the seguences for functions of EUT and in case of failure enable an operator to recognise the nature of failure by display or by operator s interaction The test seguences shall be selected from the following below according to the functions defined by the manufacturer of the EUT and the performance criteria A Bor C shall be selected according to the disturbance to be tested B 2 Read write and storage of data B 2 1 Particular test conditions Data read and write cycles shall be repeated with internal storage devices such as semi conductor memories magnetic or optical disks or magnetic tape devices and then the copied back data shall be compared with the original Read only memories ROM shall be read repeatedly and this data compared with the expected data B 2 2 Particular performance criteria Performance criterion A During the test storage devices shall maintain normal operation both in read write and in stand by conditions Performance criterion B During and after the test failures which can be recovered by read and write retries are permissible temporary delay in processing caused by this process is acceptable Normal operation of the EUT shall be restored after the test self recovery to the conditions immediately prior to the application of the test is accepted where this is a normal means of recovery In these cases operator response is permitted to re initialise an operati
48. nt and the balun impedance are to be chosen according to the intended Figure A 4 Demodulation on analogue lines set up 2 Configure the test set up in accordance with the basic standard defined in Tables 1 to 4 and Clause 4 2 3 3 Apply the appropriate EM Phenomenon whilst monitoring the demodulated levels using the set up defined in Figure A 4 Appropriate measures may be needed to prevent the EM disturbances impacting the AE and measurement eguipment During testing the EUT shall meet the performance reguirements given in Table A 4 Table A 4 Maximum demodulated differential mode signals at analogue ports Frequency band Type of continuous RF immunity test MHz Maximum demodulated signal dBm see and 0 15 to 10 Conducted 50 10 to 30 Conducted 50 to 30 see and except 26 95 to 27 29 26 95 to 27 29 Conducted 40 see 30 to 80 Conducted 20 80 to 1 000 except at 900 Radiated 30 900 see Radiated 50 The 900 MHz test is at a single spot frequency accuracy 1 MHz This requirement is not applicable for countries where no digital mobile services operate at this freguency The 3 dB bandwidth of the measurement equipment shall be 100 Hz 20Hz Limits are with respect to 600 O Levels change linearly with the logarithm of the freguency At the transition freguencies the lower level applies A 2 5 Measurement method spot freguency test The communicati
49. nterference phenomena are applied Performance criterion A The EUT shall operate without degradation of performance or loss of function during and after the application of the disturbance For example there shall be no loss of connection additional reproducible errors loss of synchronisation demodulated noise level exceeding the limits for a telecommunication terminal as defined in Annex A applicable for two wire POTS interface only If degradation in performance is observed and the system is adaptive i e has the capability to automatically retrain in the presence of a disturbing signal then for conducted immunity tests only the following procedure shall be followed 1 For each range of disturbing frequencies where degradation in performance is observed three frequencies beginning middle and end shall be identified 2 At each of the frequencies identified in step 1 the disturbing signal shall be turned on and the system is allowed to retrain If the system is able to retrain and then function for a dwell time of 60 s without any additional reproducible errors or loss of synchronization then the system s performance is considered acceptable 3 The frequencies identified in step 1 and the data rates achieved in step 2 shall be recorded in the test report Performance criterion B Degradation of the performance as described in criteria A is permitted in that errors are acceptable during the application
50. oad Interconnecting cables shall be of a type and length specified in the individual eguipment reguirements One subassembly of each type of ITE necessary for the basic operation shall be included in the POST to be evaluated For a system one of each type of ITE that can be included in the possible system configuration shall be included in the POST In the case of POSTs which functionally interact with other ITE including any ITE that is dependent on the Central Processing Unit CPU for its power interface either the actual interfacing EUT or simulators may be used to provide representative operating conditions provided the effects of the simulator can be isolated or identified Note that it is important that any simulator used instead of the actual interfacing ITE properly represents the electrical and in some cases the mechanical characteristics of the interfacing ITE especially RF signals and impedances The POST shall execute a program which shall exercise each function whose integrity is to be assessed during the test As a minimum the functions noted below shall be assessed Where more than one function is to be assessed the software shall be flexible enough to permit the test operator to select certain functions if so desired A parallel or serial execution of the test is permitted provided that the POST can operate in this manner To facilitate the testing the software shall alert the operator when a failure has occurred The POST
51. of information should be considered to be possible when a virtual path is established to the called TTE 3 8 establishment of a telephony call the operating procedure for a user or an automatic process in conjunction with the network to reach the capability to exchange information with another TTE NOTE See Note of 3 7 3 9 reception of a telephony call the operating procedure for a user or an automatic process initiated by and in conjunction with the network to reach the capability to exchange information with another TTE NOTE See Note of 3 7 3 10 maintenance of a telephony call the capability of exchanging information without having to clear and re establish a call NOTE See Note of 3 7 BS EN 55024 2010 10 CISPR 24 O IEC 2010 3 11 clearing of a telephony call the operating procedure for a user or an automatic process in conjunction with the network either at the initiative of the local party or the distant party to stop the capability of exchanging information by an orderly return to a state where the establishment of a new call is possible NOTE See Note of 3 7 3 12 network terminator NT associated eguipment representing the termination of the telecommunication network 3 13 telephony service a service providing users with the ability for real ttme two way speech conversation via a network see ITU T l 241 1 3 14 telecommunications terminal equipment TTE equipment intended to be connec
52. of the frequency At the transition frequencies the lower acoustic sound pressure level applies Acoustical adaptor between handset and plastic tube a Handset Plastic tube used as acoustical connection between handset and ae microphone b Microphone shielded in a metallic box at mc the ground plane IEC 2018 10 a Acoustical properties are compensated out by the calibration procedure Inner and outer diameter is 15 mm and 19 mm respectively typical Total length of plastic tube is 1 5 m typical b Conically formed adaptor which is connected acoustically to the various forms of handsets with some type of soft rubber This stable coupling of the handset to the acoustical tube should not be changed between the calibration and the measurement Figure A 2 Example test set up for measuring the sound pressure level from the acoustic output device of a telephone handset BS EN 55024 2010 24 CISPR 24 IEC 2010 ne Ch Acoustic measuring amber interface wall Microphone Audio acoustic 9M interface Fi 0 4 m IEC 2019 10 Where possible the microphone should be located outside the test area to remove the problem of the microphone demodulating the 1 kHz tone A flexible plastic tube connecting the EUT audio port being monitored to the microphone may be used for this purpose All connections shall be lossless All losses within the measuring interface and tube shall be compensated for The
53. of the test However the application of the test shall not cause the system to lose the established connection or retrain At the cessation of the test the system shall operate in the condition established prior to the application of the test without user intervention For surge testing on a c mains ports or d c power ports of xDSL equipment under Tables 3 or 4 degradation in the performance of the EUT as described above is permitted provided the EUT operates as intended at the cessation of the test BS EN 55024 2010 CISPR 24 IEC 2010 43 Performance criterion C Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the test or can be restored after the test by the operator BS EN 55024 2010 44 CISPR 24 O IEC 2010 Bibliography IEEE 1284 IEEE Standard Signaling Method for a Bidirectional Parallel Peripheral Interface for Personal Computers Description IEEE 1394 IEEE Standard for a High Performance Serial Bus Description ITU T Recommendation G 991 1 High bit rate Digital Subscriber Line HDSL transceivers ITU T Recommendation G 991 2 Single pair high speed digital subscriber line SHDSL transceivers ITU T Recommendation G 992 1 Asymmetrical digital subscriber line ADSL transceivers ITU T Recommendation G 992 3 Asymmetrical digital subscriber line ADSL transceivers 2 ADS
54. on Performance criterion C Failures during test that result in a delay in processing or a system abort which after testing can be recovered to normal operation by reset or reboot are permissible B 3 Data display B 3 1 Particular test conditions Text or graphics shall be displayed on display devices such as CRT monitors liguid crystal plasma or LED displays BS EN 55024 2010 30 CISPR 24 O IEC 2010 B 3 2 Particular performance criteria Performance criterion A During the test when seen from the normal viewing distance the EUT shall operate with no change beyond the manufacturer s specification in flicker colour focus and jitter except for the power freguency magnetic field test Power freguency magnetic field test For CRT monitors the following also applies The jitter shall be measured when the CRT monitor is immersed in a continuous magnetic field of 1 A m r m s at one of the power freguencies of 50 Hz or 60 Hz For displays with pixels having continuous luminance distributions only jitter may be measured using a measuring microscope of at least 20 power The movement is determined by visual alignment of the microscope cursor or comparator reticle with the extreme positions of the centroid or edge of a character or test object during the observation period For any display type a special display measuring device may be used This device shall determine on a scan by scan basis the relative location o
55. on and operational functionality of the TTE shall be verified during the application of single spot freguencies The following are applicable to the spot freguency tests defined in Tables 1 to 4 BS EN 55024 2010 26 CISPR 24 O IEC 2010 Table A 5 TTE performance criteria for spot freguency tests Established communication shall be Yes maintained Communication shall be started Yes Communication shall be stopped Yes NOTE 1 For ISDN equipment using primary access the following also applies The number of loss of frame alignments shall be less than 10 within a test period of 10 s Where it can be clearly established that a voice call is maintained throughout the test it is not then reguired to evaluate the loss of frame alignment NOTE 2 Where the established communication is maintained the start stopping of communication is only applicable to EUT with a dial function that provides emergency service call capability A 3 Non continuous radio frequency disturbances For non continuous radio freguency disturbances apply the criteria defined in Table A 6 for all appropriate tests given in Tables 1 to 4 Table A 6 TTE performance criteria for non continuous radio freguency disturbances Performance criteria Established communication shall be maintained Communication shall be started Before and after the application Before and after the of the test application of the test Communication shall be stopped Befo
56. pendent upon the EUT more than one criterion defined in the annexes may apply for example a TTE attached to a LAN shall meet the criteria defined in Annex A and Annex C 6 Conditions during testing 6 1 General conditions The tests shall be made exercising all primary functions in the most representative mode consistent with typical applications The test sample shall be configured in a manner consistent with typical installation practice If the EUT is part of a system or can be connected to associated equipment then the equipment shall be tested while connected to the minimum representative configuration of associated equipment necessary to exercise the ports in a similar manner to that described in Clause 8 of CISPR 22 The configuration and mode of operating during the tests shall be precisely noted in the test report It is not always possible to test every function of the apparatus in such cases the most critical mode of operation shall be selected If the EUT either has a large number of terminals or a large number of ports with similar connection types then a sufficient number shall be selected to simulate the actual operating conditions and to ensure that all the different types of termination are covered Coil cables such as keyboard cables shall not be intentionally stretched during testing For such cables the length specified in the table notes refers to the stretched conditions The test eguipment or associated eguipment
57. plication of the test Performance criterion C There shall be no loss of function following the restoration of the system by the operator Loss or corruption of volatile or non volatile memory is not permitted Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable or can be restored after the test by the operator BS EN 55024 2010 40 CISPR 24 O IEC 2010 Annex H normative xDSL Terminal eguipment H 1 General This annex details the specific reguirements for Digital Subscriber Line DSL terminal equipment such as ADSL VDSL and SDSL which all use a single wire pair and HDSL which can use up to 3 wire pairs H 2 Particular test conditions A minimum test configuration consists of two pieces of eguipment interconnected with manufacturer specified physical cable The cable shall be of a length representative of normal usage to ensure testing is performed at nominal values of all signal conditions Associated eguipment necessary to the data transmission function shall be included in the test configuration Unused ports shall be treated according to the manufacturer s instructions Typically the eguipment shall be configured as shown in Figure H 1 The EMC test eguipment is not shown Customer end Exchange end eguipment under test Access network i Splitter EU oppor Splitter DSL line simulator
58. pplied in the indirect mode see IEC 61000 4 2 for use of the Vertical Conducting Plane VCP BS EN 55024 2010 12 CISPR 24 O IEC 2010 For contact discharge the reguirement to apply ESD discharges at lower levels as defined in Clause 5 of IEC 61000 4 2 is not applicable b Air discharge at apertures and insulating surfaces On those parts of the EUT where it is not possible to perform contact discharge testing the EUT should be investigated to identify the user accessible points where breakdown may occur examples are openings at edges of keys or the covers of keyboards and telephone handsets Such points are tested using the air discharge method 4 2 2 Electrical fast transients EFT The test method is given in IEC 61000 4 4 However the test set up for in situ measurements is not applicable for ITE The test procedure is as given in IEC 61000 4 4 together with the following changes and clarifications if the EUT contains several ports with the same particular interface only one shall be tested multiconductor cables such as a 50 pair telecommunication cable shall be tested as a single cable Cables shall not be split or divided into groups of conductors for this test applicable only to cables which according to the manufacturer s specification support communication on cable lengths greater than 3 m the cable length between the EUT and the coupling device shall be as short as possible in the range 0 5
59. rd criterion Radio frequency 0 15 80 MHz IEC 61000 4 6 See 4 continuous conducted 3 V unmodulated r m s 80 AM 1 kHz 3 2 Surges 0 5 kV peak IEC 61000 4 5 Test applied lines 1 2 50 8 20 Tr Th us to earth ground See gt Electrical fast transients kV peak IEC 61000 4 4 Tr Th ns Repetition frequency kHz If d c power is fed on conductors included in a signal cable then the requirements of Table 2 only apply to this cable a The frequency range is scanned as specified However when specified in Annex A an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted test are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 Applicable only to ports which according to the manufacturer s specification may connect directly to outdoor cables BS EN 55024 2010 18 CISPR 24 O IEC 2010 Table 4 Immunity input a c power ports including equipment marketed with a separate a c d c power converter Environmental Test Basic Performance phenomenon specification standard criterion 4 1 Radio freguency 0 15 80 MHz IEC 61000 4 6 See a continuous conducted 3 V unmodulated r m s 80 AM 1 kHz 4 2 Voltage dips gt 95 reduction IEC 61000 4 11 See P 0 5 period 30 reduction 25 periods 4 3 Voltage interruptions gt 95 reduction IEC 61000 4 11 See b C 250 periods 4 4 Surges 1 2 50 8 20 Tr Th us IEC 61000 4 5 See 1
60. re and after the application Before and after the of the test application of the test NOTE Where the established communication is maintained during the application of the test the start stopping of communication is only applicable to TTE with a dial function that provides emergency service call capability A 4 Arrangements for testing small key telephone systems or PABXs A small key telephone system or PABX generally consists of a main switching and control unit referred to as main unit hereafter and a number of terminals that are attached to the main unit via extension cabling or an internal telecommunications network ITN The main switch unit will also have one or a number of connections to an external telecommunications network ETN for example PSTN ISDN DSL or a combination of these The ITN in many cases may be duite long and hence provide a significant antenna to external disturbances reguiring the need to ensure that all types of conducted disturbances are applied to internal telecommunication network ports of the main unit and the terminals This will reguire reversing and repositioning any coupling decoupling network in order to meet the reguirements of the basic standards for separation between EUT and coupling network BS EN 55024 2010 CISPR 24 IEC 2010 2 AE Terminals f f mj EUT S1 Gey EUT S2 Ley EUT S3 Example call paths AC power External EUT S1 to ETN Internal EUT S1 to EUT S
61. sed on an estimate of measurement uncertainties NOTE Measurement uncertainties are not required to be calculated 10 Immunity requirements Table 1 Immunity enclosure port Environmental Test Basic Performance phenomenon specification standard criterion Power frequency 50 or 60 Hz IEC 61000 4 8 See A magnetic field 1 A m r m s See Annex B as appropriate Radio frequency 80 1 000 MHz IEC 61000 4 3 The test level A electromagnetic field 3 V m unmodulated r m s specified is prior to Amplitude modulated 80 AM 1 KHz modulation See b 4 Electrostatic discharge Contact kV charge voltage IEC 61000 4 2 discharge 8 Air kV charge voltage discharge Applicable only to EUT containing devices susceptible to magnetic fields such as CRT monitors Hall elements electrodynamic microphones magnetic field sensors etc The frequency range is scanned as specified However when specified in Annex A an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies are 80 120 160 230 434 460 600 863 and 900 MHz 1 BS EN 55024 2010 CISPR 24 IEC 2010 17 Table 2 Immunity signal ports and telecommunication ports Environmental Test Basic Performance phenomenon specification standard criterion 2 1 Radio freguency 0 15 80 MHz IEC 61000 4 6 See 4 and continuous conducted 3 V unmodulated r m s 80 AM 1 kHz 2 2 1 kV peak IEC 61
62. st IEC 61000 4 1 1 2004 Electromagnetic compatibility EMC EN 61000 4 1 1 2004 Part 4 11 Testing and measurement techniques Voltage dips short interruptions and voltage variations immunity tests BS EN 55024 2010 EN 55024 2010 Publication CISPR 16 1 2 A1 A2 CISPR 20 CISPR 22 mod D To be published 2006 2008 Title EN HD Specification for radio disturbance and EN 55016 1 2 immunity measuring apparatus and methods A1 Part 1 2 Radio disturbance and immunity A2 measuring apparatus Ancillary equipment Conducted disturbances Sound and television broadcast receivers EN 55020 and associated equipment Immunity characteristics Limits and methods of measurement Information technology equipment Radio EN 55022 disturbance characteristics Limits and methods of measurement 2007 201X BS EN 55024 2010 5 EN 55024 2010 Annex ZZ informative Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers protection requirements Annex I Article 1 b of the EC Directive 2004 108 EC and essential requirements of Article 3 1 b immunity only of the EC Directive 1999 5 EC Compliance with this standard provides presumption of conformity with the specified essential requirements of the Directives concerned
63. ted to a public or private telecommunications network that is a to be connected directly to the termination of a telecommunications network in order to send process or receive information or b to inter work with a telecommunications network being connected directly or indirectly to the termination of a telecommunications network in order to send process or receive information 3 15 multifunction equipment information technology equipment in which two or more functions subject to this standard and or to other standards are provided in the same unit NOTE Examples of multifunction equipment include _ a personal computer provided with a telecommunication function and or broadcast reception function _ a personal computer provided with a measuring function etc 3 16 telecommunication network port point of connection for voice data and signaling transfers intended to interconnect widely dispersed systems via such means as direct connection to multi user telecommunications networks e g public switched telecommunications networks PSTN integrated services digital networks ISDN x type digital subscriber lines xDSL etc local area networks e g Ethernet Token Ring etc and similar networks NOTE A port generally intended for interconnection of components of an ITE system under test e g RS 232 IEEE Standard 1284 parallel printer Universal Serial Bus USB IEEE Standard 1394 Fire Wire etc and used in
64. that has several operation modes tests shall be applied in the most typical mode of operation B 5 2 Particular performance criteria Performance criterion A During testing printers shall maintain the specified printing guality and normal operation Performance criterion B During testing no degradation of the printing quality beyond the manufacturer s specification such as distortion of character s or missing pixels is permissible A paper feed failure is allowed if after removal of the jammed sheets the job is automatically recovered and there is no loss of printed information Performance criterion C During testing printing errors or omission of character s which require reprinting are permissible BS EN 55024 2010 32 CISPR 24 IEC 2010 Input output failures that occur during testing that can be recovered to normal operation after testing by reset or reboot are also permissible B 6 Data processing B 6 1 Particular test conditions Data processing such as computation data conversion storage or transfer shall be performed and the results of processing shall be compared with results in normal operation B 6 2 Particular performance criteria Performance criterion A During testing failures which do not influence the specified operation within the product specification and which do not prevent automatic recovery are permissible Performance criterion B During testing failures which are recovered automaticall
65. tish Standards Online can be found at www bsigroup com BSOL Further information about BSI is available on the BSI website at www bsigroup com Copyright Copyright subsists in all BSI publications BSI also holds the copyright in the UK of the publications of the international standardization bodies Except as permitted under the Copyright Designs and Patents Act 1988 no extract may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic photocopying recording or otherwise without prior written permission from BSI This does not preclude the free use in the course of implementing the standard of necessary details such as symbols and size type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright amp Licensing Manager Tel 44 0 20 8996 7070 Email copyright bsigroup com British Standards
66. ts for retry beyond the figure defined by the manufacturer speed of data transmission rate beyond the figure defined by the manufacturer protocol failure loss of link Performance criterion B Error rate request for retry and speed of data transmission rate may be degraded during the application of the test During testing degradation of the performance as described in criteria A is permitted provided that after testing the normal operation of the EUT is self recoverable to the condition immediately before the application of the test In these cases operator response is permitted to re initiate an operation Performance criterion C During testing degradation of the performance as described in criteria A and B is permitted provided that after testing the normal operation of the EUT is self recoverable to the condition immediately before the application of the test or can be restored after the test by the operator BS EN 55024 2010 34 CISPR 24 O IEC 2010 Annex D normative Printers and plotters D 1 Particular test conditions Data shall be printed with printers or plotters No standard image is reguired but the use of a text containing more than three character fonts and at least one grid of lines is recommended Character pitch and line spacing should be small If the dot density can be selected the highest density shall be chosen Tests shall be carried out with the EUT in the printing mode D 2 Partic
67. ular performance criteria Performance criterion A The EUT shall operate without degradation of performance during and after the application of the disturbance For example there shall be no loss or corruption of data during input output operations degradation of the printed image beyond the manufacturer s specification change in output mode or character font perceptible change in dot pitch unintended line or page feed Performance criterion B As for performance criterion A with the following exceptions degradation of the printed image beyond the manufacturer s specification is allowed misalignment of the grid lines is allowed unintended line feed is allowed a paper feed failure is allowed if after removal of the jammed sheets the job is automatically recovered and there is no loss of printed information After the disturbance is removed normal operation of the EUT is self recoverable to the condition immediately before the application of the test this may involve an operator response to re initiate the operation Performance criterion C Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test or can be restored after the test by the operator BS EN 55024 2010 CISPR 24 IEC 2010 35 Annex E normative Copying machines
68. y but cause temporary delay in processing are permissible Performance criterion C Failures during testing that result in a delay in processing after the external disturbance is removed but which can be recovered after testing to normal operation by a reset or reboot are permissible Failures during testing that result in a system abort which can be recovered to normal operation after testing by reset or reboot are permissible Failures during testing that are followed by alarms and can be recovered to normal operation by the operator s intervention after testing are permissible BS EN 55024 2010 CISPR 24 IEC 2010 33 Annex C normative Local area networks LAN Co Particular test conditions A minimum test configuration consists of two pieces of terminal eguipment interconnected with manufacturer specified physical cable Associated eguipment necessary to the function of the LAN shall be included in the test configuration Unused ports shall be treated according to the manufacturer s instructions The system shall be capable of delivering and receiving data at the specified nominal transmission rate The LAN equipment executes a programme which exercises the LAN functions As a minimum the functions below shall be assessed C 2 Particular performance criteria Performance criterion A During and after the test the EUT shall operate without error rate beyond the figure defined by the manufacturer reques

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